Process for the manufacture of formaldehyde



trio discharge,

h dei It has also become known thatcarbon. dioxide vwith hydrogen in the presence of done 26,

sermon, rsnrnsnrnitn, or snnnrn-rnrrrnnnor, shamans.

- r assess m The ransrsraoronn or roareamantran;

bio Drawing."

To whom a may ccmcer n:v it known that I, ARTHUR many, haveinvented'a certain new and useto l Process for aldehyde (for which I have tion in Germany," May 11, 1921)," the following-is a'sp'ecification. v

' The invention has for its object the manmade applicaof which ufacture of formaldehyde from carbon di-l:

oxide and hydrogen.

It has become known certain circumstances, such as a gradual electo a polymer'of the formaldee I steam and in a very high temperature either to 350 degrees oentig rade. After the gases fj have passed thronght he device containingatmospheric. orhincreased pressure v'to'rrn small Comptes Rendus, volume 150,'page 1568, andvolume .151, page 358; C. S.,,vol1 1me 87, a e-91o).- r

t has been proved that the combination of hydrogen with carbon dioxide is quite possible in a technical :yiel'd'jif to the. mix dioxide. and hydrogen small.-

quantities of steam are added. This mix hydrogen and steam is passed over a" contact substance .whioh'is v ture of carbon ture of carbon dioxide,

heated'toa temperature of about from 2410 the Manufacture oflFo'rm frorn literature that arbon dioxide and hydrogen combine -under quantities of formaldehyde;- (see.

Application filled Jane 12, wit} serial No. SMQGS.

vv j the contact substance the-mixture of steam as HEINEMANN, citizen of the German Republic, residing at- Berlin-Tempelhof, Dorfstrasse 23,. :Ge'r

and forr'naldehyde is condensed and collected as a llquid solution of formaldehyde;

Carbon dioxide .and hydrogen gases which m y 111. have been converted are recovered.

.'lhe process is carried out in such: manto porcelain, pumice stone, asbestos, coke, char-i coal, and artificial carbon, may be used.

In order to .obtainthe \greatest possible yield {of 'formaldehydejit is preferable to provide the contaCVsubs'tanceS with a-me tallicxdeposit of copper, ni'ckeland the -like'5 which are capable of occluding hydrogen' I claim as myflinv'ention- 1'. "A process for the manufacture of for- I maldehyde from carbon dioxide and hydrogen,,- wherein carbon dioxide arid hydrogen 55 in the presence of steam are" passed overy orou's substances at a temperature of about rom-MO to 350idegrees centi grade.

2'. A process according to claim 1, whereinthe-porou's contact substances are pro- W vided with metallic deposits, In testimony whereof I have hereunto set my hand.

' ARTHUR HEINEMQANNV'. f 

